The Great bustard (Otis tarda) is probably the heaviest living flying animal. It can be seen in central/south Europa and temperate Asia. But Portugal and Spain now contain about 60% of the world’s Great bustard population. A male Great bustard is typically 90–105 cm (2 ft 11 in–3 ft 5 in) tall, with a length of around 115 cm (3 ft 9 in) and has a 2.1–2.7 m (6 ft 11 in–8 ft 10 in) wingspan. The male can range in weight from 5.8 to 18 kg (13 to 40 lb). Females are much smaller, weighing from 3.1 to 8 kg (6.8 to 17.6 lb).